[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

            Bug ID: 106427
           Summary: RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel
                    lockup
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: txtoxtox285@googlemail.com

Kernel: 4.16.7

My monitor’s native mode is (some variant of) 5120x2880 at 60Hz. When amdgpu is
loaded during startup, it picks up this mode from the monitor and switches to
it just fine.

However, when I start a minimal X (X.Org X server 1.19.5, amdgpu 1.3.0) without
/etc/X11/xorg.conf and just an xterm and no window manager, I can see the for a
fraction of a second the xterm window in the upper left corner of the screen
before the monitor turns black. It’s not turned off, the monitor’s power LED
shows that it’s on.

When I try to switch to another Linux console with Alt+Tab+F6, nothing happens;
the console is not switched (I can verify this because typing “echo -en '\a'”
doesn’t beep).

After ca. 1:30 min the console finally *is* switched but remains black. The
kernel spews out messages about timeouts, and I have to reboot the machine
(from ssh or Ctrl+Alt+Del).

I can use X with 5K if I restrict the refresh rate to 30 Hz (from “cvt 5120
2880 30”).

This bug is present since kernel 4.15.10 or thereabouts, which was the first
version where amdgpu would work with dc = 1.

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #1 from txtoxtox285@googlemail.com ---
Created attachment 139402
  --> https://bugs.freedesktop.org/attachment.cgi?id=139402&action=edit
dmesg-4.16.7

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #2 from txtoxtox285@googlemail.com ---
Created attachment 139403
  --> https://bugs.freedesktop.org/attachment.cgi?id=139403&action=edit
Xorg.log

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #3 from txtoxtox285@googlemail.com ---
I would like to mention that “cvt 4096 2304 -r” is a mode that works under X so
it may not be the 60 Hz as such but rather the increased bandwidth, which needs
DisplayPort 1.3 instead of just 1.2.

(However, when X is terminated the Linux console goes black because it seems
that the driver cannot switch back to 5k@60Hz.)

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

txtoxtox285@googlemail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #139403|Xorg.log                    |Xorg.log 5k@60
        description|                            |

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

txtoxtox285@googlemail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #139402|dmesg-4.16.7                |dmesg-4.16.7 5K@60
        description|                            |

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #4 from txtoxtox285@googlemail.com ---
Created attachment 139514
  --> https://bugs.freedesktop.org/attachment.cgi?id=139514&action=edit
dmesg-4.16.7 4K@60

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #5 from txtoxtox285@googlemail.com ---
Created attachment 139515
  --> https://bugs.freedesktop.org/attachment.cgi?id=139515&action=edit
Xorg.log 4k@60

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #6 from txtoxtox285@googlemail.com ---
Still present with kernel 4.17.0, xorg amdgpu 18.0.1.

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #7 from txtoxtox285@googlemail.com ---
Kernel 4.18.1, xorg amdgpu 18.0.1: All quiet on the Western Front.

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #8 from txtoxtox285@googlemail.com ---
I have always wondered why 5k works in the frame buffer but not Xorg. 4.19
bring some progress in this regard and made things more consistent: Now the
console stays blank too.

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

--- Comment #9 from txtoxtox285@googlemail.com ---
Created attachment 142235
  --> https://bugs.freedesktop.org/attachment.cgi?id=142235&action=edit
dmesg-4.19.0 with drm.debug=0x1ff

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[Bug 106427] RX560, 5k@60Hz, Xorg: Black screen, “soft” kernel lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106427

txtoxtox285@googlemail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

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